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Bug 2251237 - VM's disk is deleted when backup is taken for its root disk
Summary: VM's disk is deleted when backup is taken for its root disk
Keywords:
Status: CLOSED MIGRATED
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: openstack-cinder
Version: 17.1 (Wallaby)
Hardware: Unspecified
OS: Unspecified
medium
high
Target Milestone: ---
: ---
Assignee: Cinder Bugs List
QA Contact: Yosi Ben Shimon
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-11-23 14:50 UTC by Alex Stupnikov
Modified: 2025-05-23 04:25 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2025-01-22 13:30:42 UTC
Target Upstream Version:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker OSP-30546 0 None None None 2023-11-23 14:52:03 UTC
Red Hat Issue Tracker OSP-33506 0 None None None 2025-01-22 13:30:42 UTC
Red Hat Issue Tracker   OSPRH-13253 0 None None None 2025-01-22 13:30:41 UTC

Description Alex Stupnikov 2023-11-23 14:50:13 UTC 
Description of problem:
Backup process seem to be broken for active VM when Cinder when NFS backend is used for cinder-volume and cinder-backup services:

- at first a separate volume is created from VM's disk
- then separate CoW image is created on top of original disk
- then original disk is deleted
- then a separate volume created during first step is deleted as well

As a result, VM is left with CoW disk image without backing image and Nova generates the following error when instance is rebooted:

2023-11-16 17:52:16.219 2 ERROR nova.virt.libvirt.guest libvirt.libvirtError: Cannot access backing file '/var/lib/nova/mnt/MNT-ID/volume-UUID1' of storage file '/var/lib/nova/mnt/MNT-ID/volume-UUID1.UUID2' (as uid:107, gid:107): No such file or directory


Version-Release number of selected component (if applicable):
RHOSP 17.0 and RHOSP 17.1.1


How reproducible:
- ask cinder-backup to create a backup of running instance in environment with NFS backend used for cinder and cinder-backup


Actual results:
VM's original disk image is removed while CoW image created on top of it still points to original image.

Expected results:
Original image is either left or CoW image should point to another disk.


Additional info:
Log extracts will be provided privately.
Comment 14 Red Hat Bugzilla 2025-05-23 04:25:10 UTC 
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days
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